RT Journal Article SR Electronic T1 Adolescent smoking JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 658 OP 658 DO 10.1503/cmaj.1060240 VO 176 IS 5 A1 Jennifer O'Loughlin A1 André Gervais YR 2007 UL http://www.cmaj.ca/content/176/5/658.1.abstract